A re-configurable subwavelength sound absorber based on active membrane-type acoustic metamaterials
A re-configurable subwavelength sound absorber based on active membrane-type acoustic metamaterials
Membrane-type acoustic meta-materials (MAM) are composed of a thin, pre-stressed membrane with periodically attached masses. This design allows for a very thin and lightweight construction that, in combination with a back cavity, can achieve perfect sound absorption at sub-wavelength length scales. However, MAM-based sound absorbers achieve significant sound absorption values only in a narrow frequency band. This means that when tonal noise from sources with varying tonal frequencies(e.g. propeller engines) should be reduced using these absorbers, the noise reduction will be significantly impaired as soon as the tonal frequency of the source falls outside the sound absorption frequency band of the MAM.In this contribution, a preliminary investigation of an active MAM-based absorber with re-configurable sound absorption frequency bands will be presented. The proposed active MAM consists of a MAM with attached electro-dynamic actuators and sensors, which could enable an in-situ modification of the MAM properties. An analytical model of the active MAM absorber will be used to study different sensor-actuator combinations that could be used to achieve the control of the sound absorption band over a wide frequency range.
Langfeldt, Felix
2bf86877-f2cd-4c35-be0f-e38a718a915c
September 2023
Langfeldt, Felix
2bf86877-f2cd-4c35-be0f-e38a718a915c
Langfeldt, Felix
(2023)
A re-configurable subwavelength sound absorber based on active membrane-type acoustic metamaterials.
Forum Acusticum, , Torino, Italy.
11 - 15 Sep 2023.
8 pp
.
Record type:
Conference or Workshop Item
(Paper)
Abstract
Membrane-type acoustic meta-materials (MAM) are composed of a thin, pre-stressed membrane with periodically attached masses. This design allows for a very thin and lightweight construction that, in combination with a back cavity, can achieve perfect sound absorption at sub-wavelength length scales. However, MAM-based sound absorbers achieve significant sound absorption values only in a narrow frequency band. This means that when tonal noise from sources with varying tonal frequencies(e.g. propeller engines) should be reduced using these absorbers, the noise reduction will be significantly impaired as soon as the tonal frequency of the source falls outside the sound absorption frequency band of the MAM.In this contribution, a preliminary investigation of an active MAM-based absorber with re-configurable sound absorption frequency bands will be presented. The proposed active MAM consists of a MAM with attached electro-dynamic actuators and sensors, which could enable an in-situ modification of the MAM properties. An analytical model of the active MAM absorber will be used to study different sensor-actuator combinations that could be used to achieve the control of the sound absorption band over a wide frequency range.
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2023-02_active_mam_absorber
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Accepted/In Press date: 29 June 2023
Published date: September 2023
Venue - Dates:
Forum Acusticum, , Torino, Italy, 2023-09-11 - 2023-09-15
Identifiers
Local EPrints ID: 480531
URI: http://eprints.soton.ac.uk/id/eprint/480531
PURE UUID: 74d8035c-f37a-4954-a699-4af9584079d4
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Date deposited: 04 Aug 2023 16:33
Last modified: 17 Mar 2024 04:11
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